LTC9103 Series

8-Channel IEEE802.3bt (PoE 2) PSE Analog Controller

Catalog

8-Channel IEEE802.3bt (PoE 2) PSE Analog Controller

Part	Type	Standards	Internal Switch(s)	Current - Supply	Auxiliary Sense	Mounting Type	Operating Temperature [Max]	Operating Temperature [Min]	Number of Channels	Voltage - Supply [Max]	Voltage - Supply [Min]	Power - Max [Max]	Package / Case	Supplier Device Package	Supplier Device Package [x]	Supplier Device Package [y]
Analog Devices LTC9103AUKJ#PBF	Controller (PSE)	802.3af (PoE), 802.3at (PoE+), 802.3bt		11 mA		Surface Mount	85 °C	-40 °C	48	3.6 V	3 V	71.3 W	64-WFQFN Exposed Pad	64-QFN	7	11

Catalog

8-Channel IEEE802.3bt (PoE 2) PSE Analog Controller

Key Features

• Fully Compliant IEEE 802.3bt Type 3 and 4 PSE

• Fully Compliant IEEE 802.3at Type 2 PSE

• Software-Compatible with LTC4291-1/LTC4292

• Up to 48 PSE Ports with One Power Channel per Port

• Up to 24 PSE Ports with Two Power Channels per Port

• ECC-Protected eFlash and Data RAMs

• Low Power Path Dissipation per Channel100mΩ Sense Resistance30mΩ or Lower MOSFET RDS(ON)

• 100mΩ Sense Resistance

• 30mΩ or Lower MOSFET RDS(ON)

• Chipset Provides Electrical IsolationEliminates Optos and Isolated 3.3V Supply

• Eliminates Optos and Isolated 3.3V Supply

• Very High Reliability Multipoint PD DetectionConnection Check Distinguishes Single-Signature and Dual-Signature PDs

• Connection Check Distinguishes Single-Signature and Dual-Signature PDs

• Continuous Per-Port Power and Current Monitoring

• 1MHz I2C Compatible Serial Control Interface

• Pin or I2C Programmable PD Power

• Available in 24-Lead 4mm × 4mm (LTC9101‑1) and a 64-Lead 7mm × 11mm (LTC9102/LTC9103) QFN Packages

Description

The LTC9101-1/LTC9102/LTC9103 chipset is a 48-port power sourcing equipment (PSE) controller designed for use in IEEE 802.3at Type 2, 802.3bt Type 3 and 4 compliant Power over Ethernet (PoE) systems. The LTC9101-1/LTC9102/LTC9103 is designed to power compliant 802.3af, 802.3at, and 802.3bt PDs. The LTC9101-1/LTC9102/LTC9103 chipset delivers lowest-in-industry heat dissipation by utilizing low-RDS(ON)external MOSFETs and 0.1Ω sense resistance per power channel. A transformer-isolated communication protocol replaces expensive opto-couplers and complex isolated 3.3V supply, resulting in significant BOM cost savings.Advanced power management features include per-port 14‑bit current/power monitoring, programmable current/power limits, and versatile fast shut-down of preselected ports. An advanced power management host software layer is available. PD detection uses a proprietary multipoint detection mechanism ensuring excellent immunity from false PD identification. Autoclass and 5-event physical classification are supported. The LTC9101-1/LTC9102/LTC9103 includes an I2C serial interface operable up to 1MHz. The LTC9101-1/LTC9102/LTC9103 is pin or I2C programmable to negotiate PD delivered power up to 71.3W.APPLICATIONSPoE PSE Switches/Routers and Midspans